Will Smith and Ninja kick off Youtube's annual 'Rewind' video

With the year coming to an end, Google&rsquo;s various services often take the time to recap what happened. Like usual, YouTube Rewind is &ldquo;celebrating the videos, people, music and moments that defined 2018.&rdquo; However, the annual Rewind mashup video is different this year around, and has more input from YouTube creators